<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		div{
			width: 100px;
			height: 100px;
			background-color: red;
			color: #fff;
			margin:10px;
		}

		div:nth-child(2){
			/*display: block;*/
			visibility: visible;
		}
		table tr td{
			width: 100px;
			height: 30px;
			border:1px solid black;

		}

		table{
			border-collapse: collapse;
			caption-side: top
		}
	</style>
</head>
<body>
		<table>
			<caption>学生信息表</caption>
			<colgroup>
				<col style="background-color: red">
				<col style="background-color: blue">
				<col style="background-color: orange" span="2">
			</colgroup>
			<tr>
				<td></td>
				<td></td>
				<td></td>
				<td></td>
			</tr>
			<tr>
				<td></td>
				<td></td>
				<td></td>
				<td></td>
			</tr>
			<tr>
				<td></td>
				<td></td>
				<td></td>
				<td></td>
			</tr>
			<tr>
				<td></td>
				<td></td>
				<td></td>
				<td></td>
			</tr>
			<tr>
				<td></td>
				<td></td>
				<td></td>
				<td></td>
			</tr>
			<tr>
				<td></td>
				<td></td>
				<td></td>
				<td></td>
			</tr>
		</table>


	<div>div1</div>
	<div>div2</div>
	<div>div3</div>
</body>
</html>









